Enhancing parameter precision of optimal quantum estimation by direct quantum feedback

Enhancing parameter precision of optimal quantum estimation by direct quantum feedback
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通过直接量子反馈提高最优量子估计的参数精度

DOI:
10.1103/physreva.91.033805
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发表时间:
2015-03
期刊:
影响因子:
2.9
通讯作者:
Zhi Qi-jun
Zhi Qi-jun
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zheng Qiang;Ge Li;Yao Yao;Zhi Qi-jun

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Various schemes have been proposed to overcome the drawback of the decoherence on quantum-enhanced parameter estimation. Here we suggest an alternative method, quantum feedback, to enhance the parameter precision of optimal quantum estimation of a dissipative qubit by investigating its dynamics of quantum Fisher information. We find that compared with the case without feedback, the quantum Fisher information of the dissipative qubit in the case of feedback has a large maximum value in time evolution and a smaller decay rate in the long time.
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